📖 Add simple Changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+- Display of configuration options on `-v` toggle
+
+### Changed
+
+- Simplified grep invocation to adhere more closely to POSIX
+
+<!-- ### Deprecated -->
+
+<!-- ### Removed -->
+
+### Fixed
+
+- Custom picker, clipper, and typer command invocation (`BEMOJI_CLIP_CMD`)
+
+<!-- ### Security -->
+
+<!-- ## [0.2.0] - 2022-06-29 -->